1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
masya89 [10]
3 years ago
10

4x^2-7x=15 Solve by factoring and please please please explain or show the work

Mathematics
1 answer:
vodomira [7]3 years ago
8 0

Answer:

x=3 and x=-1.25

Step-by-step explanation:

4x^2-7x=15

subtract 15 from each side:

4x^2-7x-15=0

factor  (trying different numbers that the sum is 7 and the quotient is 15)

(2x-6 )(2x+2.5 )=0

2x-6=0 add 6 to each side

2x=6

x=3

2x+2.5=0   subtract 2.5 from each side

2x=-2.5

x=-1.25

You might be interested in
A new road was added near Riana's neighborhood. The road is 5 miles long, and the city plans 1/10 to place a streetlight every m
elena55 [62]

Answer:

= 49  

Answer.

Step-by-step explanation:

Solution:-

Length of the road = 5 miles

Distance between every two streetlights = 1/10 miles

Total number of streetlights placed on the new road = 5 ÷ 1/10

= 5*10

= 50 streetlights

As there is already a streetlight at the beginning of the new road, so the number streetlights will be = 50 - 1

5 0
3 years ago
Read 2 more answers
Use Words,Pictures or Numbers, make a Math Arguement.
Pavel [41]
13, 6+7=13 thats my answer :D
8 0
3 years ago
An hourglass consists of two sets of congruent composite figures on either end. Each composite figure is made up of a cone and a
belka [17]
Answer: third option 268.8

Explanation:

For this kind of proble it is very important that you attach the figure because it contains important information to understand the question.

I have attached the figure for better understanding.

1) The top portion (and the bottom is congruent but rotated 180°) of the hourglass is a figure equivalent to a cylinder on top and a cone on bottom.

So the total volume contained in the top portion is the volume of a cylinder + the volume of a cone.

This is how you calculate the volume of the top portion:

1) The height of the cylinder is 54 mm - 18 mm = 36 mm

2) The formula for the volume of a cylinder is V = π (radius)^2 * height

radius = 8 mm
height = 36 mm

=> V = π(8mm)^2 * 36 mm = 2304π (mm)^3

3) The formula for the volume of a cone is V = (1/3)π(radius)^2 * height

radius = 8 mm
height = 18 mm

V = (1/3)π(8mm)^2 * 18 mm = 384π (mm)^3

4) The total volume of the top portion is volumen of the cylindrical part + voume of the cone:

Total voluem = 2304π (mm)^3 + 384π (mm)^3 = 2688π (mm)^3

5) To find the number of seconds <span>it take until all of the sand has dripped to the bottom of the hourglass you have to divide the total volumen of sand by the rate:

time in seconds = total volume of sand / rate of dripping

time in seconds = [2688 π (mm)^3 ] / [10π (mm)^3 / s] = 268.8 s

That is the answer: 268.8 s
</span>

4 0
3 years ago
Read 2 more answers
6383 to the nearest hundred<br>​
olasank [31]

Answer:

6400

Step-by-step explanation:

its 6400 to the nearest hundred

3 0
3 years ago
Read 2 more answers
Triangle BAC was rotated 90° clockwise and dilated at a scale factor of 2 from the origin to create triangle XYZ. Based on these
ololo11 [35]

Answer:b=x

Step-by-step explanation:

8 0
3 years ago
Other questions:
  • If a path is 1.6 miles long and you hiked 5/10 of the path how far did you go?
    12·1 answer
  • The cake store is having a 50\%50%50, percent off sale on all of its cakes. If the cake you want regularly costs \$14$14dollar s
    7·1 answer
  • The letters of "FALCONS" should be evenly spaced across a 59-inch-wide banner, with no margins. Each letter is 5 inches wide. Ho
    7·1 answer
  • Evaluate the integral by interpreting it in terms of areas. In other words, draw a picture of the region the integral represents
    10·1 answer
  • 3<br> -3-2-1<br> (2 зх<br> what is the solution to the system shown in this graph
    15·1 answer
  • Pls answer it i really need the answers : (
    12·1 answer
  • Si un automóvil tiene 1.500 kg de masa y una velocidad de 5 m/s, ¿cuál es la energía cinética de un automóvil?
    14·1 answer
  • What is 4+4+4+4 I need it ​
    12·2 answers
  • Which equation has a solution of r = 1/3
    10·2 answers
  • the north american plate and the pacific plate have been sliding horizontally past each other along the san andreas fault line f
    7·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!